639547133 has 2 divisors, whose sum is σ = 639547134. Its totient is φ = 639547132.

The previous prime is 639547033. The next prime is 639547141. The reversal of 639547133 is 331745936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453988249 + 185558884 = 21307^2 + 13622^2 .

It is a cyclic number.

It is not a de Polignac number, because 639547133 - 2¹⁶ = 639481597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639547033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319773566 + 319773567.

It is an arithmetic number, because the mean of its divisors is an integer number (319773567).

Almost surely, 2^639547133 is an apocalyptic number.

It is an amenable number.

639547133 is a deficient number, since it is larger than the sum of its proper divisors (1).

639547133 is an equidigital number, since it uses as much as digits as its factorization.

639547133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 41.

The square root of 639547133 is about 25289.2691274382. The cubic root of 639547133 is about 861.5705629720.

The spelling of 639547133 in words is "six hundred thirty-nine million, five hundred forty-seven thousand, one hundred thirty-three".